From patchwork Thu May 7 11:54:49 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Shevchenko X-Patchwork-Id: 11533251 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 442B1139A for ; Thu, 7 May 2020 11:54:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 369E221473 for ; Thu, 7 May 2020 11:54:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725809AbgEGLy4 (ORCPT ); Thu, 7 May 2020 07:54:56 -0400 Received: from mga17.intel.com ([192.55.52.151]:54063 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726093AbgEGLyz (ORCPT ); Thu, 7 May 2020 07:54:55 -0400 IronPort-SDR: tXkUqN8MdGeyEs6CJOgVANYPNBRnaldUhP/arztHsIUXx0cSSCk3ESkGWMEllgw9Dx2TVajv/c 1PJRzsnBuLhw== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 May 2020 04:54:55 -0700 IronPort-SDR: G+1tGLeyeX+c3i+QNwtZonqiVB3Ns1TYNjsN4ChnKQvoNA6XMIctZjT5oEuT0X59wQiilq02Yg JSm3DPm9z6/g== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,363,1583222400"; d="scan'208";a="435265515" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga005.jf.intel.com with ESMTP; 07 May 2020 04:54:53 -0700 Received: by black.fi.intel.com (Postfix, from userid 1003) id C6BE1101; Thu, 7 May 2020 14:54:52 +0300 (EEST) From: Andy Shevchenko To: Mark Brown , linux-spi@vger.kernel.org, Wan Ahmad Zainie Cc: Andy Shevchenko Subject: [PATCH v1 2/2] spi: dw: Get rid of dma_inited flag Date: Thu, 7 May 2020 14:54:49 +0300 Message-Id: <20200507115449.8093-2-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200507115449.8093-1-andriy.shevchenko@linux.intel.com> References: <20200507115449.8093-1-andriy.shevchenko@linux.intel.com> MIME-Version: 1.0 Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org This flag is superfluous in all cases where it's being used, i.e. * ->can_dma() won't be called without dma_inited == 1 * DMA ->exit() callback can rely on txchan and rxchan variables So, get rid of dma_inited flag. Signed-off-by: Andy Shevchenko --- drivers/spi/spi-dw-mid.c | 28 ++++++++++++++-------------- drivers/spi/spi-dw.c | 2 -- drivers/spi/spi-dw.h | 1 - 3 files changed, 14 insertions(+), 17 deletions(-) diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c index 8b7b94c5a9ccf..177e1f5ec62b2 100644 --- a/drivers/spi/spi-dw-mid.c +++ b/drivers/spi/spi-dw-mid.c @@ -57,20 +57,21 @@ static int mid_spi_dma_init_mfld(struct device *dev, struct dw_spi *dws) dws->rxchan = dma_request_channel(mask, mid_spi_dma_chan_filter, rx); if (!dws->rxchan) goto err_exit; - dws->master->dma_rx = dws->rxchan; /* 2. Init tx channel */ tx->dma_dev = &dma_dev->dev; dws->txchan = dma_request_channel(mask, mid_spi_dma_chan_filter, tx); if (!dws->txchan) goto free_rxchan; + + dws->master->dma_rx = dws->rxchan; dws->master->dma_tx = dws->txchan; - dws->dma_inited = 1; return 0; free_rxchan: dma_release_channel(dws->rxchan); + dws->rxchan = NULL; err_exit: return -EBUSY; } @@ -80,29 +81,31 @@ static int mid_spi_dma_init_generic(struct device *dev, struct dw_spi *dws) dws->rxchan = dma_request_slave_channel(dev, "rx"); if (!dws->rxchan) return -ENODEV; - dws->master->dma_rx = dws->rxchan; dws->txchan = dma_request_slave_channel(dev, "tx"); if (!dws->txchan) { dma_release_channel(dws->rxchan); + dws->rxchan = NULL; return -ENODEV; } + + dws->master->dma_rx = dws->rxchan; dws->master->dma_tx = dws->txchan; - dws->dma_inited = 1; return 0; } static void mid_spi_dma_exit(struct dw_spi *dws) { - if (!dws->dma_inited) - return; - - dmaengine_terminate_sync(dws->txchan); - dma_release_channel(dws->txchan); + if (dws->txchan) { + dmaengine_terminate_sync(dws->txchan); + dma_release_channel(dws->txchan); + } - dmaengine_terminate_sync(dws->rxchan); - dma_release_channel(dws->rxchan); + if (dws->rxchan) { + dmaengine_terminate_sync(dws->rxchan); + dma_release_channel(dws->rxchan); + } } static irqreturn_t dma_transfer(struct dw_spi *dws) @@ -126,9 +129,6 @@ static bool mid_spi_can_dma(struct spi_controller *master, { struct dw_spi *dws = spi_controller_get_devdata(master); - if (!dws->dma_inited) - return false; - return xfer->len > dws->fifo_len; } diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c index b9f651e9ca028..6de196df9c966 100644 --- a/drivers/spi/spi-dw.c +++ b/drivers/spi/spi-dw.c @@ -470,7 +470,6 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws) dws->master = master; dws->type = SSI_MOTO_SPI; - dws->dma_inited = 0; dws->dma_addr = (dma_addr_t)(dws->paddr + DW_SPI_DR); spin_lock_init(&dws->buf_lock); @@ -509,7 +508,6 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws) ret = dws->dma_ops->dma_init(dev, dws); if (ret) { dev_warn(dev, "DMA init failed\n"); - dws->dma_inited = 0; } else { master->can_dma = dws->dma_ops->can_dma; } diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h index 490cff260a3eb..e92d43b9a9e60 100644 --- a/drivers/spi/spi-dw.h +++ b/drivers/spi/spi-dw.h @@ -141,7 +141,6 @@ struct dw_spi { u32 current_freq; /* frequency in hz */ /* DMA info */ - int dma_inited; struct dma_chan *txchan; struct dma_chan *rxchan; unsigned long dma_chan_busy;